/Engine/Source/Runtime/SlateCore/Public/Widgets/SWidget.h
Calculates what if any clipping state changes need to happen when drawing this widget.
the culling rect that should be used going forward.
[FSlateRect](API\Runtime\SlateCore\Layout\FSlateRect) CalculateCullingAndClippingRules ( const [FGeometry](API\Runtime\SlateCore\Layout\FGeometry) & AllottedGeometry, const [FSlateRect](API\Runtime\SlateCore\Layout\FSlateRect) & MyCullingRect, bool & bClipToBounds, bool & bAlwaysClip, bool & bIntersectClipBounds ) const